[Franc1sco]

You can do a plugin like boomix so when player press IN_ATTACK1 or IN_ATTACK2 (code for check button presses -> https://forums.alliedmods.net/showthread.php?t=151142 ) then you apply more or less velocity (code that modify velocity and you could use -> https://github.com/Franc1sco/Franug-...e_menu.sp#L206 ).

If you need more help I could help you since I like the idea.